This view shows enzymes only for those organisms listed below, in the list of taxa known to possess the
pathway.
If an enzyme name is shown in bold, there is experimental evidence for this enzymatic activity.

Summary:
Cytokinins, which are N6-substituted purine derivatives, are a class of plant hormones that plays important physiological roles in plants, from promotion of cell division, to release of lateral buds from apical dominance or delay of senescence. Cytokinin homeostasis is regulated by the rate of biosynthesis, import, conjugation (mainly in the form of glycosides) and degradation. Cytokinins are irreversibly degraded by cytokinin oxidases which catalyse cleavage of the N6-isopentenyl-side chain resulting in formation of adenine-type compounds. Cytokinins isopentenyladenine, zeatins and their ribosides are cleaved in a single enzymatic step by oxidative side chain cleavage. This activity has been recorded in many plants and is thought to plant a key role in controlling cytokinin levels in plants.